Donald Trump spokeswoman Hope Hicks and campaign manager Corey Lewandowski were seen having a public screaming match on the street in Manhattan on Wednesday night.

Onlookers were stunned to see Hicks, 27, hollering at Lewandowski, 42, in plain view of passersby on 61st Street near Park Avenue.

One witness told us, “Hope was screaming at Corey, ‘I am done with you!’ It was ugly, she was doubled over with her fists clenched. He stood there looking shocked with his hands on his head.”

Other sources insist the street showdown was about how to handle the announcement that seasoned political operative Paul Manafort would be taking an even larger role in Trump’s campaign, and how Lewandowski’s role would be defined going forward.

Another source told us, “It was a campaign-related disagreement. They were arguing how the announcement about Manafort taking more responsibility would be handled. There is an internal struggle to define what Corey’s role would be.”

A third source added, “It was a continuation of a discussion about when the announcement would go out. Corey wanted to wait until Thursday to give him a chance to talk to certain people first. Hicks was under pressure by others to make the announcement sooner.”

Either way, it is a sign of internal discord in the Trump campaign between the Lewandowski and the Manafort camps.

Hicks — who had previously defended Lewandowski over claims that he was involved in a physical altercation with a female reporter — declined to comment Thursday night. Lewandowski also didn’t comment.